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Chemical nano-scale homogeneity of austenitic CrMnCN steels in relation to electronic and magnetic properties

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Abstract

Measurements of conduction electron spin resonance, temperature-dependent magnetization, small angle neutron scattering, and transmission electron microscopy were used for the analysis of chemical nonhomogeneity in austenitic steels with carbon + nitrogen or carbon only. It is shown that all studied steels are characterized by a nonhomogeneous distribution of alloying elements on the fine scale: from 3 to 5 nm in CrMnCN steels to about 30 nm in MnC Hadfield type steel. In the CN steels, their chemical homogeneity is improved by decreasing the C/N ratio. A ferromagnetic-type temperature behavior is observed in the CN steels at temperatures below 86 K, which is attributed to the blocking of magnetic moments of superparamagnetic clusters. The short-range decomposition of all studied steels results in a different splitting of dislocations, which corresponds to two different values of the stacking fault energy.

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Authors and Affiliations

  1. Department of Optics and Spectroscopy, V. Ye Lashkarev Institute for Semiconductor Physics, 03028, Kiev, Ukraine

    B. D. Shanina

  2. Department of Alloyed Steels, G.V. Kurdyumov Institute for Metal Physics, 03680, Kiev 142, Ukraine

    A. I. Tyshchenko, I. N. Glavatskyy, Yu N. Petrov & V. G. Gavriljuk

  3. Institute for Complex Magnetic Materials, Helmholtz Centre Berlin for Materials and Energy, 14109, Berlin, Germany

    I. N. Glavatskyy

  4. Konstantinov St. Petersburg Nuclear Physics Institute, Gatchina, Russia, 188350

    V. V. Runov

  5. Ruhr University Bochum, 44801, Bochum, Germany

    H. Berns

Authors
  1. B. D. Shanina
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  2. A. I. Tyshchenko
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  3. I. N. Glavatskyy
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  4. V. V. Runov
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  5. Yu N. Petrov
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  6. H. Berns
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  7. V. G. Gavriljuk
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Correspondence to V. G. Gavriljuk.

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Shanina, B.D., Tyshchenko, A.I., Glavatskyy, I.N. et al. Chemical nano-scale homogeneity of austenitic CrMnCN steels in relation to electronic and magnetic properties. J Mater Sci 46, 7725–7736 (2011). https://doi.org/10.1007/s10853-011-5752-9

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  • DOI: https://doi.org/10.1007/s10853-011-5752-9

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